Rick Hudson was sitting at his booth at the California Workers Compensation & Risk Conference on Thursday scanning emails on his smartphone during a slow period when he was asked what the most significant change to his job has been over the last year or two. Hudson, president and CEO of Irvine, Calif.-based Hudson Investigations Inc., gave his answer in a fraction of a second.“Social media.” Hudson spends a lot of his time tracking down and ferreting out workers comp fraud suspects, and nowadays he starts his search right at his desk by combing through postings on Facebook, Twitter or Instagram.